Whenever you cycle or discard a card, you may pay {1}. If you do, each opponent loses 2 life and you gain 2 life.
Swampwalk (This creature can’t be blocked as long as defending player controls a Swamp.) Cycling—Pay 2 life. (Pay 2 life, Discard this card: Draw a card.) 3/4
All Slivers have “At the beginning of your upkeep, this permanent deals 1 damage to you.” 5/5
Black creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.) 1/3
{T}, Exile an Assassin card from your graveyard: Destroy target creature. 2/2
When Gray Merchant of Asphodel enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.) 2/4
Whenever Headless Rider or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token. 3/1
Destroy target nonblack creature. At the beginning of your next upkeep, pay {2}{B}. If you don’t, you lose the game.
As Engineered Plague enters, choose a creature type. All creatures of the chosen type get -1/-1.
Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent. {1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.) 5/4
Flying Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control. Cycling {2} ({2}, Discard this card: Draw a card.) 5/4
At the beginning of your upkeep, sacrifice a permanent. Whenever Greater Harvester deals combat damage to a player, that player sacrifices two permanents.
When Boggart Harbinger comes into play, you may search your library for a Goblin card, reveal it, then shuffle your library and put that card on top of it.
Enchant creature Enchanted creature has deathtouch and indestructible. Morph—Sacrifice another creature. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) As Gift of Doom is turned face up, you may attach it to a creature.